DE3132828C2 - Connection means for wooden rods and method for installing the connection means - Google Patents

Abstract

According to the invention, a connecting piece in the form of a metal tube is glued into a bore with an annular cross-section in the end face of bars made of grown or glued wood. In this way, a multi-layer gluing is created, which exerts reduced splitting tensile forces on the rod end. The load introduction via the sleeve-shaped gluing distributes the loads better over the wood cross-section and at the same time represents a constriction for the wood cross-section lying within the circular ring groove. The glued-in metal rods have a larger glued surface with a shorter embedment depth than a solid rod. A method is given by means of which it is possible to glue thin-walled metal sleeves which mean only a slight weakening of the wood cross-section. The glue, including void-filling glue, can be introduced into the annular groove via a glue feed channel in such a way that air inclusion is avoided and a full wetting of all glue surfaces is achieved. Further designs of the jacket surfaces with glue grooves and profiles help ensure that the glue is distributed in the annular groove so that a high bond is achieved on all glue surfaces. The invention also provides for an additional tying of round timber with collar rings or the like, which are able to prevent the splitting of wooden rods with low splitting tensile strength.

Description

3 4

According to Swiss patent CH 2 33 812, metal rods are pressed in, which is advantageous

Connecting dowels for insertion into pre-drilled soldering holes cause the glue to penetrate the surfaces of the ring groove

rather, the parts to be connected are incorporated from two an angle. It can even be achieved

each other enclosing sleeve-shaped arms that glue as a result of the tubular structure of the wood

known which are used in circular ring bores. 5 penetrates into the wood structure and solidifies

The dowels result due to one of the wood's contributions through the mantle

inner surface enlarged friction surface a better further embellishments of the invention provide

Stop in the holes. In the case of the connecting dowel, which ensures that when using glue with a high

is inserted into the miter surfaces in order to create the vision part and the profile of the outer surface of the metal

To dowel the miter, the glue joint is bottle-shaped on the sleeve to form the drill hole.

shaped arm mainly transverse forces effective, for which most is increased by compressing the

the additional friction surface on the inner surface of the sleeve - wood structure or through the removal of wood components,

before there is no improvement.

inner surface does not increase the transverse force transmission is that the glue with a firmness

happy contribution. This is a notable disadvantage. 15 see the strength of the metal and the wood.

The object of the invention is, as it were, to produce a thickening of the metal spacing, with makes the disadvantages of known connection means to the effect that an additional form fit of the ends and a shorter glued-in length results in higher load anchoring. You cannot achieve this in this way to transfer and the occurring splitting tensile forces in only one intimate bond via the glue, but Reduce wood cross-section. 20 a kind of interlocking of the metal according to the form fit the invention this object is achieved by the stabs.

specified in the characterizing part of claim 1 The excess glue forms the surface of the metal features solved stabs a higher quality bond, so that the glue in the

The gluing of the metal rod takes place in the ring groove hardened state, as it were, a subsequent one both on the inner wall of the borehole and on the thickening of the metal rod in the deepest part of the borehole Instead of there is a much larger area of glue

before available which the metal rod over- The invention has also set itself the task

wearable load with shorter embedment length in the wood - the method of gluing a ring in cross section -

can initiate cross-section as compared to a shaped metal rod, time-saving, safe and economical.

Full metal rod. 30 Hch to perform.

It succeeds with the help of the multi-layer gluing. The solution to the problem is that in the with

in the ring groove the external load is better pressed onto the wooden cross-glue ring groove the metal rod and

cut to initiate distributed. In addition, causes the screwed in, so that the lateral surfaces from all sides

Ring cross-section of the metal rod a constriction of the glue wets and the glue into the bore walls

Wood cross-section within the ring. Splitting forces tre- 35 is incorporated. According to the inventive method

Only driving in the wood lying outside the ring is one of the static requirements

on. multi-layer gluing equivalent to gluing

A major disadvantage of the glued-in threading to be achieved in one work step,

rod is eliminated by the ring reinforcement and if one pulls those known per se for gluing

made possible by a more economical use. The 40 glues that incorporate their reaction components

Anchoring of the connecting parts of thin-walled, micro-encapsulated, so when screwing in

Cross-section in the end faces of wooden rods cause the metal rod to destroy the microcapsules

only to a minimized weakening of the wood cross-section. triggered and hardening started immediately. the

Steel and wood cross-sections can then be set according to the hardening of the glue depending on the temperature

the respective strengths of 45 to be combined in a period of 30 minutes to 2 hours.

Better coordination of steel and wood. This enables time-saving installation without additional

According to the special embodiment of the invention, additional measures such as drying the wood, pressing

is to apply the glue in the narrow, slender sen of the glue joint, heating, takes several days

Annular groove provided its own glue feed channel. de storage until completely hardened.

In the case of a ring diameter of more than 2 cm, the invention provides 50. According to one embodiment of the invention, the

training also suggests that according to the viscosity of the excess glue with incorporated solids to it

Glue several glue supply channels are available. use that in the area of the deepest the hole

The arrangement of the channels depends from case to wall to be removed or displaced, on the one hand

Case as required. As a rule, the build-up of hydrostatic pressure in the

Channel horizontal, but in special cases also inclined 55 glue, on the other hand also through the removal of

bottom up from the surface of the wood transverse wood. This leads to the fact that the metal rod

in the deepest part of the borehole, because the glue in the next

the. Also supply channels in the form of a circular Boh-bound state like a graft on the

Ments parallel to the inner or outer surface of the metal becomes effective. The special advantages

The ring groove from the end face of the wooden rod can already be used in the material claims

prove to be appropriate. received.

Of particular advantage is the decoration of the. The process of gluing can be according to a

Invention, which provides that the glue feed channel further development of the invention to the effect

is sealed against re-emergence of the glue. The disadvantage is that it simplifies the fact that the metal rod is hammered in

Sometimes when using a cavity filling, with 65 and in between is rotated. In a series production

glue equipped with hard aggregates, a cation builds up, however, as a rule, one will set up on it.

then if there is an excess of glue with small glue, screw in the metal rod with the help of a suitable

Gap thickness a hydrostatic pressure when the th device that can be attached to the rod head.

Additional facilities or configurations of the free, non-glued metal rod end for easier Grasping and turning when carrying out the procedure are appropriate on a case-by-case basis and are based on the guidelines according to the diameters of the metal rod, as well as according to the type and size of the devices used.

Anchors according to the invention can be ideally adapted to the respective requirements in that the diameter of the metal rod is chosen as the respective circumstances require. From the point of view of the even entry of the loads into the wooden stick, it is recommended, however, to optimize the diameter of the metal rod in such a way that the cross-section within the ring is larger than the wood cross-section lying outside the ring. This results from the consideration that the cross-section of wood lying within the ring due to the constriction effect of the metal rod Able to carry a relatively higher load than the rest of the wood cross-section

If the respective type of wood makes it seem appropriate because of the structure, the gluing if possible to make at the edge zones, where the higher wood strength is available, then is as according to the invention provided, the residual wood cross-section lying outside the ring cross-section is much smaller and capable of transferring loads even in multiple layers. The invention is based on two Drawings of an exemplary embodiment explained

F i g. 1 shows a longitudinally parallel section through the wooden stick end with glued-in metal stick of ring-shaped Cross-section with glue feed channel,

Fig. 2 is a sectional view along the line II-II of Fig. 1.

In Fig. 1, the metal rod with an annular cross-section is glued in such a way that the wood cross-sectional area A lying outside the annular groove is smaller than the core area K.

In the example shown, the metal rod 1 has an internal thread 7 into which a screw is screwed can be. The glue supply channel 5 is shown here arranged horizontally Round piece 6 sealed. The glue joint 8 is bulged to the bottom of the borehole. The metal rod is on the outer jacket surface 3 and the inner jacket surface 4 fully glued

In FIG. 2, the cross-section H-II from FIG. 1 but shown without a metal rod. Inside the annular groove 9 is the core area K, outside the annular groove is the area A. In the example shown here, the glued laminated timber bar has a square cross-section. It can also be rectangular or circular in cross-section. According to the invention, the ratio of the core area K to the remaining area A is greater than 1. In the case of wood with a low splitting tensile strength, it can be useful to choose a ratio of less than 1.

In special cases, two glue feed channels 5 diametrically opposite one another are expedient. she turn out to be necessary if the glue distribution is no longer ensured from a feed channel The design of the non-glued metal rod end depends on the intended use and can be designed very differently, in one In the case of an external thread proves to be useful, in the other case a slot with a hole for one Plug connection or screw or an internal thread for screwing in a bolt. The example given gives only a hint of the variety of possibilities.

1 sheet of drawings

Claims (7)

1 2 as a result, which, among other things, also includes a high proportion of solids with a high degree of hardness. These glues are capable of high bond strength 1. Form anchoring of a connecting means in the end face even if cavities or foot surfaces have to be filled by rods made of 5 genes subject to normal force, such as eg. B. in the case of a gap wood, in particular made of grown or board between the connecting element and the borehole wall,
laminated wood, with a metal rod glued into an axially aligned hole in the end face of a glued board layer, the rod glued-in thread scange causes the hole (9) to stress splitting tensile forces in the wood cross-section and the metal rod (1) in an In a known manner, the cross-sections of the threaded rod must therefore have an annular cross-section, and the outer surfaces or their stresses must be matched to the cross-section of the metal rod (1), a profiled ring for receiving wood. According to the relevant of the glue show and the ratio of the core area technical recommendations, an edge distance of before K to the remaining area /! Greater than 1 at least 4d must be maintained, if as d the 2. Anchoring according to claim 1, characterized in that the diameter of the threaded rod is designated. Even indicates that in the depth of the hole, the gluing length cannot be freely selected. You have to be in At least one glue feed channel is arranged and a minimum glue length of 10d is observed 3. Anchoring according to claim 1 or 2, characterized in that a glued length of at most 20 d for the load can be used in the area of the transfer. Decisive for the Lastabtra borehole depth a thickening is 20 gung is the bond strength of the wood. It requires 4. Anchoring according to one of claims 1 to 3, usually so large areas of glue that the glued length characterized in that a gap-filling of the threaded rod is greater than 20 d. The shell glue with a high solid content is used before the threaded rod of 20 d of gluing length is sufficient 5.Methods of gluing a metal rod generally do not prevent the load of the rod,
according to one of claims Ibis 4, characterized in that the metal rod with axial pressure and / or pressure load, which can be picked up by the wood cross-section 4 d χ 4 d, cannot be transferred into the glue-filled bore via a screwing movement into the glue-filled bore, because it is displaced in order to work the glue into the bore wall - ultimately the glue surfaces as the outer surface of the zygen. Lindrian bore cannot be chosen large enough 6. Method for gluing a metal rod 30 can. This means an uneconomical use of the according to claim 1 and 5, characterized in that the material properties of wood and steel thread thread glue the excess glue, especially in the area of bars, into the face of wooden bars the deepest, the bore walls displaced by, do not allow optimal use of both materials. A hydrostatic pressure builds up in the glue and you could imagine the front surface, for example, by Removal of wood with the glue incorporated in the 35 slit through a cross-shaped slot, rated solids. in order to create specially shaped 7. Method for gluing a metal rod to glue tall pieces, which in the sum larger Leimnach Claim 5, characterized in that the surfaces have as the pure round rod. Because wood, however Metal rod hammered in and subject to internal stresses in between must be expected is turning. 40 become that by severing the end of the rod Delay occurs which makes gluing considerably sword would. Besides that, they would Splitting forces are not reduced but only increased. One would consequently turn to a very § The invention relates to the anchoring of an unfavorable ratio of metal cross-section to wood <| To connect, work in the face of the normal force cross-section. Apart from that, the }! said rods made of wood, especially from waxed. glue such shaped parts with considerable M nem or board-glued wood, associated with one in trouble. It is hardly imaginable ρ an axially directed bore glued in metal rod bar that this way an economical installation U and method of making the anchorage. 50 of the lanyard can be achieved. ψ The development in the field of glue made possible- threaded bolts are almost exclusively used today in ['light the gluing of threaded steel rods glued into board-glued rods. In grown [ä Wood components, which are used for the production of connections nem wood, such. B. round wood, such discharges are Il and thrusting can be used. In particular, this is only possible to a limited extent because the wood is shrinking In glued laminated timber construction, threaded rods across 55 cause a loss of bond strength when • to the grain of the wood, but also glued lengthways. Set radial shrinkage cracks with. The cleavage strength of ; ί The resorcinol resin, which is best known today, succeeds in grown wood is also considerably less than that \ ■; ne secure gluing only when the surface of glued wood. Therefore, one in the end face would The steel rod has a thread profile with a threaded rod glued in from grown wood a longitudinal groove with a ^{cross-section of approx. 7 mm 2} , which makes it possible to use only a very low load : light that the excess glue can be removed when gluing. the hole can escape. These glues result in a structural density A high adhesive bond only if the glue increases from the cross-section center to the edge, ; ^: layer thickness is very thin, and the hole in the wood is smaller, it is also important that the glue is than the thread outside diameter. Compare: 65 firm edge area is carried out. One at the core - ,. Monier, Hemmer "Glued-in threaded rods" Ar- glued-in threaded rod would be due to the reduced beitsgemeinschaft Holz, Volume 6, May 81. The shear strength of the heartwood is also only low. In the meantime, other synthetic resin glues can also transfer loads with Erge.